Comparative Analysis of Water Vapor Characteristics of Three Rainstorm Processes in Hami City
Based on the conventional meteorological observations,hourly precipitation data of regional automatic stations,NCEP/NCAR and the GDAS reanalysis data,the circulation background,water vapor transport,convergence(divergence)and water vapor budget of three heavy rainfall processes in Hami city from 2018 to 2019 are compared.The results show that the three heavy rain processes all occur under the circulation background of low vortex in Balkhash Lake and high pressure ridge in Mongolia,the Ural high pressure ridge in the middle troposphere is stronger and the low vortex is deeper,the South Asian high pressure center in the upper troposphere moves eastward and upper-level jet over Hami,the heavy rain intensity is favorable.The water vapor source,water vapor transport path and water vapor contribution are different in the three heavy rainfall processes.The multi-source of water vapor source and the water vapor contribution of water vapor sources have influences on the intensity of rainfall in Hami city.The Mongolian anticyclone in the middle and lower troposphere is conducive to the transport of warm and wet air to the rainstorm area along Hexi Corridor,which contribute to the rainstorm.The water vapor budgets are different at four boundaries,the eastern boundary in lower level and the western boundary in middle and upper level are the main input water vapor.The intensity,maintenance and convergence intensity of net inflow of water vapor at each boundary play the key roles in the development and maintenance of heavy precipitation.
万方数据
维普
